详解Spring Boot加载properties和yml配置文件

详解Spring Boot加载properties和yml配置文件

一、系统启动后注入配置

package com.example.config;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.context.annotation.Configuration;

import org.springframework.context.annotation.PropertySource;

import org.springframework.core.env.Environment;

/**

* @author: GrandKai

* @create: 2016-09-01 11:24

*/

@Configuration

@PropertySource(ignoreResourceNotFound = true, value = {"classpath:/config/email.properties","classpath:/config/email.yml"}, name = "email")

public class Config {}

需要在ApplicationContext中注册配置

AnnotationConfigEmbeddedWebApplicationContext context = (AnnotationConfigEmbeddedWebApplicationContext) app.run("参数1");

context.register(Config.class);

用以下方式取值

Environment env = context.getEnvironment();

System.out.println(env.getProperty("address"));

email.yml文件配置如下：

server:

address: 127.0.0.1

二、在命令行传入注入到程序中

public class Main {

public static void main(String... args) {

//initialize the command line parsing stuff

OptionParser parser = new OptionParser();

parser.accepts("greeting").withRequiredArg();

OptionSet options = parser.parse(args);

//create the actual Spring PropertySource

PropertySource> ps = new JOptCommandLinePropertySource(options);

//setup the Spring context

AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();

ctx.getEnvironment().getPropertySources().addLast(http://ps);

//register the property source with the environment

ctx.register(Greeter.class);

ctx.refresh();

Greeter greeter = ctx.getBean(Greeter.class);

greeter.sayGreeting();

}

}

@Component

class Greeter {

@Inject private Environment env;

//the following would also work

//@Value("${greeting}")

//private String greeting;

/**

* Print out the 'greeting' property if it exists, and otherwise, "Welcome!".

*/

public void sayGreeting() {

System.out.println(env.getProperty("greeting", "Welcome!"));

}

}

public static void main(String [] args) {

SimpleCommandLinePropertySource ps = new SimpleCommandLinePropertySource(args);

@SuppressWarnings("resource")

AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();

ctx.getEnvironment().getPropertySources().addFirst(ps);

ctx.register(ApplicationConfig.class);

ctx.refresh();

}

@Configuration

@EnableScheduling

@ComponentScan("com.mycompany.package")

@PropertySource(

value = {"classpath:/application.properties", "file:${config.location}"},

ignoreResourceNotFound = true

)

class ApplicationConfig {

@Bean

public static PropertySourcesPlaceholderConfigurer propertyConfigurer() {

return new PropertySourcesPlaceholderConfigurer();

}

}

@Component

class MyComponent {

@Value("${my.property.data}")

private String myPropertyData;

@Scheduled(fixedDelayString = "${schedule.delay.period}")

public void run() {

:

}

}

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